> * It's reasonable to be skeptical about any fund having a goal that's anything other then maximizing long-term returns.
I really don't think it is. If I'm a sophisticated investor, I may want to invest in funds which hedge against tail-risk, or provide broad exposure to some specific sector, etc. Neither of these things are about maximising returns relative to the S&P500. There are strategies with negative expected returns in the long-run, but when added to a portfolio can improve its returns. Portfolio construction can get very complex.